CODEWITHSUNDEEP
rmatrixextract
L.J
L.J

Reputation: 1084

How to extract a part of a matrix according to dimension names

I have a matrix, and there are dimensional names for each row and column.

How can I then extract a part of the matrix according to their specific dimension names? For example, extract an observation if the dimensional name contains some specific string in it.

Thanks!

Upvotes: 0

Views: 454

Answers (1)

flodel
flodel

Reputation: 89057

I assume you are familiar with [ and that the only difficulty you have is to find row names that match a certain pattern. You need to use grep. Here is an example where I select rows that contain "North":

USArrests[grep("North", rownames(USArrests)), ]
#                Murder Assault UrbanPop Rape
# North Carolina   13.0     337       45 16.1
# North Dakota      0.8      45       44  7.3

Upvotes: 3

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